Nitrogen and hydrogen combine in the presence of a catalyst to give ammonia gas. With reference to the above reaction:

ICSE Class 10 Chemistry PYQ · 2025 Improvement · Section B

7(iv)Written · 2025 · Section B · 2025 Improvement

Nitrogen and hydrogen combine in the presence of a catalyst to give ammonia gas. With reference to the above reaction:

(a) Name the catalyst used.

(b) At what temperature does the above reaction occur?

(c) What optimum pressure should be maintained during the reaction?

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(a) Catalyst — Finely divided iron [Fe]

(b) Temperature — 450-500°C [Optimum temperature]

(c) Pressure — 200 to 900 atmospheres [Optimum pressure]

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